Isoperimetric ratio

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In analytic geometry, the isoperimetric ratio of a simple closed curve in the Euclidean plane is the ratio L2/A, where L is the length of the curve and A is its area. It is a dimensionless quantity that is invariant under similarity transformations of the curve.

Excerpt from the Wikipedia article “Isoperimetric ratio”, under the CC BY-SA 4.0 license. Read the article on Wikipedia